3 Doors Math Problem Solved (from the movie 21)

This video explains the math problem mentioned in the movie 21. In the movie Kevin Spacey is looking for students to join his blackjack crew, and in his math class he asks this question to see who can think out of the box (aka thinking mathematically?!?!). This video will explain the reasoning of why switching your choose provides a more likely chance of winning the prize, from a 33.3 percent chance of winning to a 67% chance of winning. This problem is also known as monty hall problem.